PURPOSE: To reduce power consumption of a coil by a method wherein two bar permanent magnets are arranged to face the same poles to the central finger section between an E-shaped iron core wound a coil on the central finger section and a yoke having a plane section faced to three finger sections.

CONSTITUTION: A coil 22 is mounted on the central finger section 21c, for example, of an E-shaped iron core 21 consisting of a flat soft magnetic substance and a yoke 23 consisting of a soft magnetic substance and having a plane section is arranged by facing to a finger section 21d from a finger section 21b. Furthermore, an armature 24 providing a non-magnetic substance 27 such as synthetic resin roughly shown in a two-dot chain line with two permanent magnets 25, 26 are provided between the iron core 21 and yoke 23 and the N poles of the permanent magnets 25, 26 for example, and the S poles are arranged by facing to both-side finger sections 21b, 21d of the iron core 21 and the central finger section 21c respectively. When the coil 22 is not energized, the permanent magnets 25, 26 are adsorbed to the yoke 23, and the permanent magnets 25, 26 are adsorbed to the iron core 21 side by energizing the coil. This reduces the power consumption of the coil and increases the suction and pivot force of the armature as well or permits the miniaturization of a device.